First, these are the pairing instructions.
http://www.xoutpost.com/articles/all...tooth-ulf.html
However, based on BMW TSB SI B84 13 04, you probably do not have Bluetooth. According to the TSB, these are the X3 models with Bluetooth "E83 (X3) from 9/04 production with Premium Package (ZPP) or BMW Assist (SA 639)." Furthermore, there is another statement in the TSB that says "E46, E83, E85 and E53 vehicles produced between 3/2004 and 8/2004 are equipped with a TCU that does not support Bluetooth. On these vehicles, the TCU can be replaced at the customer's expense with a 2005 MY TCU."
So, unless your TCU has been upgraded, you most likely do not have Bluetooth. The plus is that a TCU swap is very easy to do yourself for around $325. Then, you would need to take it to a dealer for coding.